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1 check the spark plug’s ignition, remove the spark plug, put on the ignition cap, spark plug ignition contact engine cylinder head spark plug, pull the hand pull, see if there is a bright spark ignition.

2 Check whether the carburetor is normal oil absorption, remove the carburetor inlet tubing, and lift the tubing, let the oil back to the tank, reinstall the tubing, close the damper, slowly pull the hand puller. At this time look at the oil entering the tubing and have it advance until it enters the carburetor.

3. Put the idle screw back in position, half the taper in front of the idle screw, and hold the throttle plate to allow the carburetor to idle back to the initial position.

4. Oil needle back to position, usually the carburetor oil needle are in 1-3 circles, here with the driver will slowly lock the two oil needles to the degree of slightly hard lock! Be careful not to break the needle with brute force! Then loosen the H oil needle 1.5 times and the L oil needle 1 times counterclockwise.

5 Before starting, remove the spark plug, close the carburetor damper, when the oil has entered the carburetor, slowly pull the hand puller 3-5 times, so that the mixed oil fully into the crankcase and cylinder.

6, start, install the spark plug and slightly tighten. With the damper closed, pull the puller slowly! The trick of the puller is to first pull out a bit to the extent of resistance, so that the puller is stuck. And then you pull it out slowly, one lap a second. If during this process, you hear a pop, pop, pop, pop sound. Then this is the machine has started signs, you can open the damper quickly pull the hand puller to start the machine, you can start up normally!

• Turn off when accelerating:

Plesae check if the pipes are aged or closed loosely resulting in air leakage. If the pipes are intact, this may be due to inadequate mixing of air and fuel, you can try to adjust the air fuel mix adjustment screw to see if the carburetor can work properly. The air fuel mix adjustment screw actually is used to control the amount of fuel.

• Engine backfires and stalls

This may be due to a leak in the pipe on the side of the carburetor connected to the air filter, or the intake and exhaust valves of the engine are not closed properly.

• Idle is normal, but when stepping on the gas, it turns off

This may be due to the low position of the carburetor float chamber needle valve, resulting in a low fuel level. You can adjust the float fuel level of the carburetor float chamber to see if will solve the problem.

• Oil Leak

Carburetor during the process of transportation, might causing the needle valve stuck and can not return, resulting in carburetor fuel leakage. You can check whether the needle valve in the carburetor float chamber is stuck, and whether the jet in the carburetor is blocked. If there is no problem with the needle valve and the jet, it may be that the fuel level of the float chamber is too high. You can try to adjust the lower float.

• The speed is unstable after installation

A leak in the rubber connector that connects the carburetor to the engine can cause this. This can also be caused by wear of the intake and exhaust valves kit, which leads to a large clearance and air leakage. You can check to see if either of the above is the cause of the problem. On the other hand, you can reinstall the original carburetor and see what went wrong.